Parse ref and rev in git

nix/sources.nix

@@ -19,7 +19,7 @@ let
       pkgs.fetchzip { inherit (spec) url sha256; };
 
   fetch_git = spec:
-      builtins.fetchGit { url = spec.repo; inherit (spec) rev; };
+      builtins.fetchGit { url = spec.repo; inherit (spec) rev ref; };
 
   fetch_builtin-tarball = spec:
     builtins.trace

src/Niv/Git/Cmd.hs

@@ -7,6 +7,7 @@
 module Niv.Git.Cmd (gitCmd) where
 
 import Control.Arrow
+import Control.Applicative
 import Data.String.QQ (s)
 import Data.Text.Extended as T
 import Niv.Cmd
@@ -32,14 +33,24 @@ gitCmd = Cmd
 -- TODO: don't hardcode here
 parseGitPackageSpec :: Opts.Parser PackageSpec
 parseGitPackageSpec =
-    (PackageSpec . HMS.singleton "repo") <$>
-      parseRepo
+    (PackageSpec . HMS.fromList) <$>
+      many (parseRepo <|> parseRef <|> parseRev)
   where
     parseRepo =
-      Aeson.String <$> Opts.strOption
+      ("repo", ) . Aeson.String <$> Opts.strOption
         ( Opts.long "repo" <>
           Opts.metavar "URL"
         )
+    parseRev =
+      ("rev", ) . Aeson.String <$> Opts.strOption
+        ( Opts.long "rev" <>
+          Opts.metavar "SHA"
+        )
+    parseRef =
+      ("ref", ) . Aeson.String <$> Opts.strOption
+        ( Opts.long "ref" <>
+          Opts.metavar "REF"
+        )
 
 describeGit :: Opts.InfoMod a
 describeGit = mconcat

src/Niv/Sources.hs

@@ -176,7 +176,7 @@ sourcesVersionToMD5 = \case
     V9 -> "87149616c1b3b1e5aa73178f91c20b53"
     V10 -> "d8625c0a03dd935e1c79f46407faa8d3"
     V11 -> "8a95b7d93b16f7c7515d98f49b0ec741"
-    V12 -> "b42c201152bb6d93c6c24388e3cf3249"
+    V12 -> "2f9629ad9a8f181ed71d2a59b454970c"
 
 -- | The MD5 sum of ./nix/sources.nix
 sourcesNixMD5 :: IO T.Text